Answer:
The possible answers are missing, luckily I found them in a google search.
A repudiate
B authorize
C foresee
D hypothesize
E question
F contend
Explanation:
If you have to choose two of them, I would say the obvious answers are D hypothesize and E question, being the two of them the only ones who maintain the objective (scientific) point of view from the scientist who are making the research.
All the other possible answers go against the objetivism premise or make no sense at all:
Hope this helps!